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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '520de7761fe55cdef022bcbf10a414c4751f1a0e2ca754dcd802c2c8e04c821a' 
  AND token = '6fGsQd0GZAOOwtDnuV6vZ4WbcTDgT4DDNQNszrcacoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}